Glossary of cycling
Wikimedia glossary list article

This is a glossary of terms and jargon used in cycling, mountain biking, and cycle sport.
For parts of a bicycle, see List of bicycle parts.
0–9
27.5 Mountain bike
A mountain bike with wheels that are approximately 27.5 inches (700 mm) in diameter and are based on ISO 584 mm (650B) rims.
29er (bicycle)
A mountain bike with wheels that are approximately 29 inches (740 mm) in diameter and are based on ISO 622 mm (700C) rims.
3:1 rule
A UCI rule stating the depth and breadth (in cross-section) of the bicycle frame tubes cannot exceed the ratio of 3:1.
A
À bloc
Going à bloc means riding as hard as one possibly can, which can be risky as it leaves one in a state where recovery is needed, and therefore vulnerable to being attacked.
Abandon
To leave a race prior to its completion - as the rider is unable to finish (for example, because of a crash or injury).
Aero bars
Extension of the handlebars usually allowing the rider to rest their elbows and benefit from improved aerodynamics. Often found on Time trial bicycles.
Aero racing bicycle
A type of racing bike that combines the aerodynamic features of a time trial bicycle with a road racing bicycle.
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